Tube mount



June 3o, 1953 LS1-sux 2,643,839-

TUBE MOUNT Filed July 29, 1948 Patented June 30, 1953 l TUBE MOUN'I` Ivan Sislik, Irvington, N. J., assignor to The Palnut Company, Irvington, N. J., a corporation of New Jersey Application July 29, 1948, Serial No. 41,290

7 Claims.

The core is provided with a threaded stem that mates with a thread engager formed on the tube mount, and by rotating the stem the core is adjusted longitudinally of the tube. Adjustment of the core may be utilized for such purposes as varying the value of the inductance, modifying the coupling in a transformer, or tuning a circuit in which the inductance is included. Usually it is necessary to make the iinal adjustment of the core or cores after assembly of the entire piece of equipment in which the inductance device is incorporated. It is also important that the adjustment be secure against vibration or accidental derangement,` and that at the same time provision be made for ready adjustments that may become desirable at any later time. Ordinarily the stern of the core is a machine screw or small size, the threads in greatest use today being 6-32 and 4-40. Even withv these small threads it is desirable that the thread engager of the tube mount be such as to maintain a holding torque on the stem of one to ve ounce-inches throughout twenty adjustments of the core.

A desirable form of tube mount for the abovementioned purposes is disclosed in United States Patent 2,386,732 issued October 9, 1945, on the invention of Joseph W. Wohlhieter. The mount therein disclosed functions well with threaded stems in which the actual sizes vary only a reasonable amount from the nominal size. However, some users prefer to employ stems having Wide variations from the nominal size, such las stems having rolled threads with a range of variation in actual size which is currently designated in the machine screw trade as class 1 tolerance. The present invention is an improvement on the Wohlhieter mount in that the mount of the present invention provides a satisfactory range of holding torque on the stem throughout a wider range of variation of the stem from its nominal size. Also, the mount of the present invention is an improvement on the Wohlhieter mount in that it provides for easier assembly of the mount with a thick chassis plate or the like. l

Objects of the present invention are to provide a tment for mounting a tube, and to provide a rltment for adjustably positioning a threaded stem extending from a tube, in Which the litment satisfactorily grips the stem despite wide variations in stem size from its nominal size.

- Another object of the invention is to increase the ease with which a tube-mounting tment may be telescoped into an apertured chassis plate, particularly a thick plate.

A further object of the invention is to improve the mount of Patent 2,386,732 and structurally similar devices by increasing its capacity to adequately cope with variations in the actual size of the threaded stem.

yA still further object of the invention is to improve the mount of Patent 2,386,732 by providing for easier insertion of the mount into a chassis plate, particularly a thick plate.

Further objects, and objects relating to details and economies of construction, manufacture, and use willmore denitely appear from the detailed description to follow.

My invention is clearly defined in the claims. In the claims, as well as in the description, parts may at times be identified by specific names for clarity and convenience, but such nomenclature is to be understood as having the broadest meaning consistent with the context fand with the concept of my invention as distinguished from the pertinent prior art. Also, in the claims as Well as in the description, the mount and its parts are, for clarity and convenience, sometimes referred to on the basis of their oriented position shown in the drawing. However, no limitation as to the positioning of the structure is to be implied, since it will be understood lthat the mount may be inverted or lused in any inclined position. The best form in which I have contemplated applying my invention is illustrated in the drawing forming part of this specification, in which:

Fig. 1 is a front elevation of the tube mount.

Fig. 2 is an elevation, looking from the left side of Fig. 1.

Fig. 3 is a top plan view ofthe tube mount.

Fig. 4 is a bottom plan view of the tube mount.

Fig. 5 is a central vertical section showing a tube and core assembled with the mount, the mount being telescoped into a chassis plate preparatory to latching the same thereto. The core and stem are shown in elevation, the showing of the stem being partly diagrammatic.

Fig. 6 is a View similar to Fig. 5 but showing the mount latched to the chassis plate.

Fig. 7 is a detail sectional view taken generally on the line 'l-l of Fig. 6, a portion of the tube being broken away and the stem being indicated in dot-dash lines.

The fitment, designated as a Whole by ID, is

generally cup-shaped in form. It is preferably stamped in one piece from a thin untempered spring steel sheet, and then hardened and tempered. The bottom portion I I of the nltment may be of inverted dome shape and may be formed with an annular seat at I2. Extending upwardly from the bottom II at opposite sides thereof are arms I4, I 4 of arcuate cross section. At their upper ends these arms merge with wings I5, i5 which extend outwardly and downwardly, notches I 3, I3 being provided at the juncture of each wing I5 and the arm III to which it is attached. One of the wings I5 is provided with a downwardly projecting finger I6. Each vertical edge of each arm It is provided with a tooth I'I which projects inwardly of the horizontal circle established by the inner surface of curvature of the arms It, i4. At opposite sides of the bottom I I, and located midway between arms I4, Ill, there are latching tongues I9, I9 which extend upwardly and outwardly. Between each arm I4 and each tongue I9 the metal may be extended upwardly at 22.3, so that the tment will have an annular portion just above the seat I2 which is continuous except where it is traversed by slot 22 which will be referred to presently.

The bottom I I has a central hole 2i the boundary of which is formed as a thread engager adapted to mate with the threaded core stern for which the tment is designed. This thread engager is preferably formed as a true thread, i. e. the edge of the hole 2| coincides with a helix of the same pitch as the thread of the stem. This pitch of the thread engager is too small to be shown to advantage in the drawings, but it is reflected to some extent in Figs. 2 and 7. A slot 22 extends diametrically of the bottom I I, passing through the hole 2i as best seen in Figs. 3 and 4.-, and extending for an appreciable distance into each of arms I 4 as best seen in Figs. 2 and 1. It will be seen that this slot diametrically severs the bottom I I in a zone passing through the hole 2l and that the zone of severance extends centrally into each of the vertical arcuate arms It, While the slot 22 may be made very narrow, it will have some width and therefore it can be conveniently referred to as establishing a zone of severance. As best seen in Figs. 8 and 4, the zone of severance is disposed crosswise to the imaginary zone which extends from one latching tongue I9 to the other latching tongue I9.

The ltment I0 is adapted to mount a tube such as 25, which ordinarily is of non-magnetic material. Some of the tubes used at present are of fibrous material in the nature of impregnated paper, while other tubes now in use are made of molded plastics or synthetic resins. Typically, one or more coils or windings will be wound en the tube as shown diagrammatically in the Wohlhieter patent, previously referred to. Telescoped into the tube 25 is a core 26 which is provided with a threaded stem 21.

In assembly the stem 2'I is threaded through the hole 2l and then the tube is telescoped over the core 26, the lower end portion of the tube being telescoped into the tment I0 until arrested by the end of the tube engaging the seat at I2. Preferably the tment I0 is so proportioned that the arcuate arms I 4, I4 resiliently clasp the tube 25, the .four teeth I' penetrating into the material of the tube.

The assembly of fitment, tube, and core is mounted on a chassis plate as explained in the aforementioned Wohlhieter patent. The chassis plate is provided with an aperture 3i of a size which will conveniently receive the ntment I9. On opposite sides of this aperture there are smaller holes 32, 32. The fitment, carrying tl e tube 25 and the core 2S, is telescoped through the aperture 3l, the tment being so oriented rotationally that the finger I6 will enter one of the holes 32 to hold the assembly against pivotal movement in the hole 3|. As the tment is inserted, latching tongues I9, I9 are cammed inwardly. After the position shown in Fig. 5 has been reached, further telescoping movement into the chassis plate results in upward eaing of the spring wings I5, I5. When the tips of latching tongues I9, I 9 pass beneath the plate 30, these tongues spring out to the position shown in Fig. 7 and, when the inserting pressure on the nti-nent is released, spring wings I5, I5 bias the tmcnt I0 upwardly so that the tips of latching tongues I8, i9 snugly engage the bottom of the chassis plate.

In some instances the tment II! may be inserted into the chassis plate before the tube 25 is inserted into the tment. However, the tube 25 is ordinarily inserted into the fitment first.

The chassis plate 3B shown in the drawing represents a plate of the maximum thickness for the particular tment II] shown. Thus, in 6, the wings I5, I5 are substantially flat against the top surface of plate 33. With a thinner chassis plate the wings I5, I5 would be in a condition between that shown in Fig. 5 and that shown in Fig. 6, but in a deiinitely stressed condition, nevertheless. The flexing of the wings I5, I5, particularly to the condition shown in Fig. 6, is facilitated by the notches I3. Because of these notches each wing I5 is disconnected from its arm I4 in zones which extend inwardly from the side edges of the arm; and this greatly adds to the flexible action of the wing although the length of metal at the juncture of the arm It and the wing I5 is sufficient to make a juncture of ample strength.

Hole 2I is made small enough so that its associated thread engager will make a sufficiently tight resilient nt with an undersize stern 2'! having the maximum variation from the nominal size. However, the zone of severance completely across the bottom I I and up into the arms It, ifi provides for relatively great effective expansion of the hole ZI, so that the thread engager can adequately cope with stems 2 which vary, plus or minus, from the nominal stem size by quite large tolerances. Furthermore, the biasing action of the wings I5, I5 against the chassis plate sets up reactive forces against the tips of latching tongues I9, I9, and these reactive forces are such as to urge the two halves of the thread engager against the thread of stem 2l. Thus, the rltment of the present invention will not only receive stems which vary from the nominal size by very large tolerances, but will maintain adequate holding torque on such stems throughout repeated adiustments of the core by rotation of the stem in the thread engager.

I claim:

l. In a one-piece tment of springy sheet metal for attaching a tube to an apertured plate and for adjustably positioning a threaded stem ei;- tending into the tube, said iitment having a bottom portion provided with a central hole the boundary of which is formedv as female thread means for screw-threaded mating with the stem, having a pair of oppositely-positioned arms of arcuate cross section extending upwardly from the periphery of said bottom portion for clasping the side wall of the tube, having wingsextending outwardly from said arms for yieldingly en1 gaging the top surface of said plate when the tment is telescoped into the aperture ti'ierein, and having oppositely-positioned latching tongues located between said arms and extending upwardly from the periphery of bottom portion in position to the under of said plate when the ntment is telescoped into the aperture therein; the improvement which comprises: said bottom portion severed through said hole in a diametrical zone which yxtends completely across the bottom portion and divides the bottom portion into two seguiron-ts the zone of severance being disposed crosswise oi the zone extending from one latching tongue to the other whereby the reactive forces exerted down wardly on the latching tongues by said plate when the fitment is mounted in the aperture therein act to urge the two segments of the bottom portion toward one another and establish substantial frictional engagement with the threaded stem.

2. In a one-piece trnent of springy sheet metal for attaching a tube to an apertured plate and for adjustably positioning a threaded stem extending into the tube, said tment having a bottom portion provided with a central hole the boundary of which is formed as female thread means for screw-threaded mating with the stem, having a pair of oppositely-positioned arms of arcuate cross section extending upwardly from the periphery of said bottom portion for clasping the side wall of the tube, having wings extending outwardly from said arms for yieldingly engaging the top surface of said plate when the tment is telescoped into the aperture therein, and having oppositely-positioned latching tongues located between said arms and extending upwardly from the periphery of said bottom portion in position to engage the under surface of said plate when the tment is telescoped into the aperture therein; the improvement which comprises: said bottom portion being severed through said hole in a diametrical zone which extends completely across the bottom portion and divides the bottom portion into two segments, the zone of severance being disposed crosswise of the zone extending from one latching tongue to the other whereby the reactive forces exerted downwardly on the latching tongues by said plate when the iitment is mounted in the aperture therein act to urge the two segments of the bottom portion toward one another and establish substantial frictional engagement with the threaded stem, and the severance extending up into each of said arms of arcuate cross section whereby the structure is rendered more yielding in response to the forces which urge the two segments of the bottom portion toward one another.

3. in a one-piece tment of sp-ringy sheet metal for attaching a tube to an apertured plate and for adiustably positioning a threaded stem extending into the tube, said itinent having a bottom portion provided with a central hole the boundary oi which is formed as female thread means for screw-threaded mating with the stem, having a pair of oppositely-positioned arms of arcuate cross section extending upwardly from the periphery of said bottom portion for clasping the side wall of the tube, having wings extending outwardly from said arms for yieldingly engaging the top surface of said plate when the fitment is telescoped into the aperture therein, and having oppositely-positioned latching tongues located between said arms and extending up- 6 wardly from the periphery'of said bottom portion in position to engage the under surface of said plate when the fltment is telescoped into the aperture therein; the improvement which comprises: said bottom portion being severed through said hole in a diametrical zone which extends completely across the bottom portion and divides the bottom portion into two segments, the zone of severance being disposed crosswisev of the zone extending from one latching tongue to the other whereby the reactive forces exerted downwardly on the latching tongues by'said plate when the ltment is mounted in the aperture therein act to urge the two segments of the bottom portion toward one another and establish substantial frictional engagement with the threaded stem, the severance extending up into each of said arms of arcuate cross section whereby the structure is rendered more yielding in response to the forces which urge the two segments of the bottom portion toward one another, and said wings being disconnected from said arms in zones extending inwardly from the side edges of the arms.

4. In a one-piece tment of springy sheet metal for attaching a tube to an apertured plate and for adjustably positioning a threaded stem extending into the tube, said tment having a bottom portion provided with a central hole the boundary of which is formed as female thread means for screw-threaded mating with the stem, having a plurality of arms disposed about said bottom portion in circumferentially-spaced relation and extending upwardly from the periphery of the bottom portion for clasping the side wall of the tube, having wings extending outwardly from said arms for yieldingly engaging the top surface of said plate when the fitment is telescoped into the aperture therein, and having a plurality of latching tongues disposed about said bottom portion in circumferentially-spaced relation and interspersed with said arms, said tongues extending upwardly from the periphery of the bottom portion in position to engage the under surface of said plate when the iitment is telescoped into the aperture therein; the improvement which comprises: said bottom portion having a zone ofseverance passing through said hole, the zone of severance extending to the periphery of the bottom portion and substantially dividing the bottom portion into two segments, and the zone of severance being disposed orosswise of a zone extending from one latching tongue to another whereby the reactive forces exerted downwardly on such latching tongues by said plate when the tment is mounted in the aperture therein act to urge the two segments of the bottom portion toward one another and establish substantial frictional engagement with the threaded stem.

5. In a one-piece tment of springy sheet metal for attaching a tube to an apertured plate and for adjustably positioning a threaded stem extending into the tube, said itment having a bot tom portion provided with a central hole the boundary of which is formed as female thread means for screw-threaded mating with the stem, having a plurality of arms disposed about said bottom portion in circumferentially-spaced relation and extending upwardly from the periphery of the bottom portion for clasping the side wall of the tube, having wings extending outwardly from Said arms for yieldingly engaging the top surfaces of said plate `when the tment is telescoped into the aperture therein, and having a plurality of latching tongues disposed about said bottom portion in-eiroumferentially-spaced relation interspersed with arms, said tongues extending upwardly from the periphery of the bottom portion in position to engage the under surface of said plate when the iitment is teleseoped .into the aperture therein; the improvement which comprises: said bottom portion having a zone of severance passing diametrically through said hole and substantially dividing the bottom portion into two segments, the zone of severance being disposed crosswise of a zone extending ,from one latehing tongue to another whereby the reactive forces exerteddownwardly on such latching tongues .by said plate when the tment is mounted in .the aperture therein act to urge the two segments of 4the bottom portion toward one another and establish substantial irictional engagement 'with the threaded stem, and the severance extending up into at least one of said arms whereby the `structure is rendered more yielding in response to the forces which urge the two segments of the bottom portion toward one another.

6. In a one-piece fitment of springy sheet metal .for attaching a tube to an apertured plate and for adjustably positioning a threaded stem extending into the tube, said iitment having a bottom portion provided with a central hole the boundary of which is formed as female thread means for screw-threaded mating with the stem, having a plurality of arms disposed about said bottom portion in ciroumferentially-spaced relation and extending upwardly from the periphery 'of the bottom portion for .olasping the side Wall of the tube, having wings extending outwardly from said arms for yieldingly engaging the top surface of said plate when Ythe viitment is telescoped into the aperture therein, and having a plurality of latching tongues disposed about said bottom portion in circumferentialiy-spaced relation and interspersed with said arms, said tongues extending upwardly kfrom the periphery of the bottom portion in position to engage the under surface of said plate when the tment is telescoped into the aperture therein; the improvement which comprises: said :bottom portion having a zone of severance passing diametrically through said hole and substantially dividing the bottom portion into two segments, the zone of severance being disposed crosswise of a zone extending from one latching tongue to another whereby the reactive forces exerted downwardly on such latching tongues by said plate when the tment is mounted in the aperture therein act to urge the two segments of the bottom portion tow-ard one another and establish substantial frictional engagement with the threaded stem, the severance extending 11p into at least one of said arms whereby the structure is rendered more yielding in response to the forces which urge the two segments of the bottom portion to-ward one another, and said wings being disconnected from said arms in zones extending inwardly from the side edges of the arms.

7. In a one-piece tment of springy material for attaching a tube to an apertured plate and for adjustably positioning a threaded stem extending into the tube, said tment having a bottom portion provided with a central hole the boundary of which is formed as female thread means for screw-threaded mating with the stem, having a pair of oppositely-positioned arms of arcuate cross section extending upwardly from the periphery of said bottom portion for clasping the side wall of the tube, having wings extending outwardly from said arms for yieldingly engaging the top surface of said plate when the tment is telescoped into the aperture therein, and having oppositely-positioned latehing tongues located between said arms and extending upwardly from the periphery of said bottom portion in position to engage the under surface of said plate when the tment is telescoped into the aperture therein; the improvement which comprises: said bottom portion being severed through said hole in a diametrical zone which extends at least substantially across the bottom portion and substantially divides the bottom portion into two segments, the zone of severance being disposed crosswise of the zone extending from one latching tongue to the other whereby the reaetive forces exerted downwardly on the latohing tongues by said plate When the trnent is mounted in the .aperture therein act to urge the two segments of the bottom portion toward one another and establish substantial frictional engagement with the threaded stem, and the severance extending up into at least one of said arms of arcuate cross section whereby the structure is rendered more yielding in response to the forces which urge the two segments of the bottom portion toward one another.

IVAN SISIK.

References Cited in the ille of this patent UNITED STATES PATENTS Number Name Date 2,386,732 Wohlhieter Oct. 9, 1945 2,404,236 Kost July 16, 1946 2,455,891 Flanagan Dec. 7, 1948 2,468,333 Johnson Apr. 26, 1949 2,496,866 Flora Feb. '7, 1950 2,503,219 Schaper Apr. 4, 1950 2,539,172 Andrews Jan. 23, 1951 

